Prolonged payment

On the 1st February 2011 I was appointed as a rep at AVBOB on a permanent basis. Upon the appointment I was given an advance of R3000 of which I had to work for 12 months before leaving the service. When I terminated employment at 11 months I was informed that I have to pay the R3000. Later AVBOB handed me over to Edward Leonard Ndzabandzaba Inc. I was informed that I have to pay R5,277.90 with the interest of 15.5% and collecting of 10% for every payment made. I started paying on the 16th January 2013 until 20 October 2016. I have already paid R9500 and I was told that I still owe R927.80 before being issued with a settlement letter. I believe I payed more than I was supposed. The reason I started paying in 2013 is because I was unemployed.